Numerical Simulation of the Influence of Platform Pitch Motion on Power Generation Steadiness in Floating Offshore Wind Turbines

Yehezkiel Tumewu (1) , Petrone Crescenzo (2) , Mettupalayam Sivaselvan (3)
(1) 1MS Reseach Associate, Department of Civil, Structural & Environmental Engineering, University at Buffalo, 212 Ketter Hall, Buffalo, NY 14260, USA , United States
(2) 2PhD Research Associate, Department of Civil, Environmental & Geomatic Engineering, University College London, 120 Chadwick Building UCL, London, WC1E 6BT , United Kingdom
(3) Associate Professor. Department of Civil, Structural & Environmental Engineering, University at Buffalo, 212 Ketter Hall, Buffalo, NY 14260, USA. , United States
https://doi.org/10.21625/essd.v2i1.39

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Issue
Vol. 2 No. 1 (2017): Sustainable Development toward the Preservation of the Environment
Submitted
October 31, 2016
Published
July 1, 2017
Keywords:
    FAST, Floating Platform, Platform Pitch, Power Output, Wind Turbine,
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Abstract

Offshore wind energy is a valuable renewable resource that is inexhaustible, strong, and consistent. To reduce cost and improve energy production efficiency, future trends are moving towards wind turbines in deep water, which use floating platforms such as tension leg platforms, barges, and semi-submersible designs. Compared to fixed based substructures, these floating platforms are in a state of constant motion which affects the power generation steadiness. The resulting complex dynamic behavior might compromise their efficiency and reduce their nominal life. The complex analysis of floating wind turbines requires computer tools that couple all the different components to represent the complete dynamic response. One such tool, developed by the National Renewable Energy Laboratory, is the aero-hydro-servo-elastic tool FAST. In this work, simplified models are used for three platform types, and the results are compared with FAST as a way of understanding the essential dynamics. Secondly, using FAST, the influence of platform pitch motion on the steadiness of power generation is examined. This analysis is done for all three platforms for a constant above rated wind speed and above average wave load. Results demonstrate that the power output fluctuation depends on the platform type and blade pitch motion. The effect of platform pitch on the steadiness of power output is only apparent under large oscillating pitch motion, where recurring power drops are observed. The semi-submersible design performs well with relatively steady power output, while the barge design has the most unsteady output, as a result of its susceptibility to typical wave loads.

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References

Statoil. (2014). Hywind – The World’s First Full-Scale Floating Wind. http://www.statoil.com/en/TechnologyInnovation/NewEnergy/RenewablePowerProduction/Offshore/Hywind/Pages/HywindPuttingWindPowerToTheTest.aspx.
[2] D. Roddier, C. Cermelli, A. Aubault, and A. Weinstein, "WindFloat: A floating foundation for offshore wind turbines," Journal of Renewable and Sustainable Energy, vol. 2, p. 033104, 2010.
[3] A. Robertson, J. Jonkman, W. Musial, F. Vorpahl, and W. Popko, "Offshore code comparison collaboration, continuation: Phase II results of a floating semisubmersible wind system," ed. EWEA Offshore 2013, 2013.
[4] A. Arapogianni, A. Genachte, R. M. Ochagaia, J. Vergara, D. Castell, A. R. Tsouroukdissian, et al., "Deep Water; The next step for offshore wind energy," ed. European Wind Energy Association (EWEA), 2013.
[5] J. M. Jonkman, "Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine, Technical Report," 2007.
[6] J. M. Jonkman and M. L. Buhl, "FA

Authors

Yehezkiel Tumewu
1MS Reseach Associate, Department of Civil, Structural & Environmental Engineering, University at Buffalo, 212 Ketter Hall, Buffalo, NY 14260, USA
c.petrone@ucl.ac.uk (Primary Contact)
Petrone Crescenzo
2PhD Research Associate, Department of Civil, Environmental & Geomatic Engineering, University College London, 120 Chadwick Building UCL, London, WC1E 6BT
Mettupalayam Sivaselvan
Associate Professor. Department of Civil, Structural & Environmental Engineering, University at Buffalo, 212 Ketter Hall, Buffalo, NY 14260, USA.
Tumewu, Y., Crescenzo, P., & Sivaselvan, M. (2017). Numerical Simulation of the Influence of Platform Pitch Motion on Power Generation Steadiness in Floating Offshore Wind Turbines. Environmental Science & Sustainable Development, 2(1), 92–101. https://doi.org/10.21625/essd.v2i1.39
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